She was being a responsible kid. If I ever have kids I would much rather find her with a dildo and not a guy on top of her. I say o assure her that its perfectly normal and that she did not do anything wrong.

She will feel very bad if you try to talk to her, things will get awkward or something. Just forget it, and next time you talk to her do it normally, dont make her feel embarrassed, masturbating its not wrong.

tell her that its normal girls her age and older to want to masterbate, and that you do it too..... tell her that everybody does it but are too embarrased to tell anyone. Its a normal part of our lives, it brings us pleasure, when we can't experience the real thing..say that its a whole lot better way to orgasm by masterbating, than having sex with someone you don't even know, or even having it at all yet, because she is probably too young.

Tell her that masterbating is normal and nothing to be ashamed of and that from now on you will knock. Also tell her its fine as long as she does it in her room. One question though how old is your daughter?

If she is very young you might want to be concerned with how she learned about it and where she got a dildo.

Regardless, talk to her and try to remove the akwardness and stigma about it. I know she doesnt want to her this but perhaps let her know you masturbate occasionally and that its ok. I got nothing else for ya, hope it works out, it should be akward for a bit.